Your installed version at the moment is Android 10 (q) 1.0. Since you bought your device at the /e/ shop you should have been running Android 9 (pie). With 1.0 /e/ made a major upgrade available, other devices can’t do that because it must be implemented for every device. I assume with that major upgrade you lost the older version with pie to have a fallback.
I hope this clears it a bit up, there are alot of deeper explanations on the forum.
You might want to ask in this post, if I am right: