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Garmin Connect activity map speed incorrect

Recently I noticed that, somehow, there is quite a difference between the tracks shown in the app and the one on the website. The first picture (Garmin connect website) shows me cycling and going for a sprint at the red part, followed by some higher speed cycling. This is actually correctly depicted and accurate. But when checking on my phone in the app, my sprint all of a sudden is somewhere completely else. The whole speed overlay seems to shift/change and be incorrect. Today’s s activity had exactly the same. Me going uphill at the lowest speed of the whole route, showing as the highest speed on the app map.
Anyone else having this issue?