Up until a few days ago when you opened a topic the post it would show was always the post after the one you last read.
Now over the last couple of days this behaviour appearers to have changed and you now open the first post in the thread. This could involve a lot of scrolling especially in the longer threads.
No, I haven't. Maybe this happens if OP did edit the opening post?
If I hover over my notifications, I see e.g. https://forum.arduino.cc/t/arduino-uno-wifi-r2-wont-upload-any-sketch/1076564/10. Clicking it takes me to the specific post in the topic.