Its important to remember that the HT Score is made up of nearly a dozen dynamic variables that are calculated (a) in real time (b) at a given snapshot in time and (c) relative within each category. Many of these variables are time based and/or relative averages so as products in your category start collecting reviews, getting fresh review content, verify their integrations--the rankings change dynamically in real time and this to be expected.
If your HT Score and/or ranking just changed but nothing changed on your profiles, this is totally normal and it could be one of many variables that are calculated real time across all products in the category (eg. review volume, integrations averages, minimum review thresholds, review recency, etc).
Not only can your own product's variables change, but its important to remember that rankings and averages are relative within each category so other products actions can impact averages which can mean your products no longer meet averages or your distance from them (eg. minimum review threshold) change and you could lose (or gain) points without doing anything and this is just in relative terms to other products in the category.
Examples of common scenarios that can change your ranking:
Change in the integrations average...if new product engages on HTR in your category and verifies their integrations, the average could go up which could impact your integrations points (ie. maybe you were getting points for being above average and now you're below the average even though your integrations count didn't change...but the category average did)
Change in the minimum review threshold...As the minimum review threshold in a category changes, so does each product in that categories' relative position to it. Lets say you are well above the min review threshold and getting full points for review quantity but you notice your ranking increase without you having gotten any new reviews. Its very possible that a competitor who was ahead of you previously was right at the minimum review threshold and now as that went up as a result of a new product generating reviews, they are no longer above it so they lost points and relatively since your product is above the min review threshold, you moved ahead in the category.
Change in review recency...Reviews older than 18-months stop getting factored into average ratings (eg. Likelihood to recommend, ease of use, etc) per the aged reviews update. So for example, if your product had a bad review or two that just became 'old' (older than 18-months that is), this could actually bump up your average ratings causing your score to increase even though you didn't get any new reviews (just some old bad ones stopped counting). On the flip side if lets say a competitor had some great reviews that just became aged (older than 18-months) their average ratings could decrease as a result causing their score to decrease and as a result, yours to increase within the category relatively speaking
As you can see, there are thousands of possible scenarios that could lead to a subtle change in your score relative within your category when you consider the # of variables in the HT Score x the # of products in a given category so this is quite common and should not come as a surprise.
How to Identify What Caused the Change
While there is no way to pinpoint the exact change since it might be a change from another product in your category relative to yours amidst thousands of dynamic variables, millions of real time data points and time based variables like review aging-- what you can do is check your Reputation Report Card for areas where you may have lost points relatively. Below is a quick video of where to look for areas that may have been impacted and changed your score.
Change in minimum review threshold
Aging reviews that are no longer counting towards your averages
Change in integrations averages
Keep relative changes in mind (ex. another product in your category gets partner recommendations, verified integrations, etc)