OBI light didnt turn off after injection?

This OBI is a little scary to me in general, so this is likely nothing, but I’d like an explanation or reassurance:

Today I used rhe Skyrizi injection like normal, it was about my 4th time at home. Everything went according to the manual: All the lights worked and the green flash light turned into a solid light and it beeped. Then I took it off. For some reason I had a harder time taking it off today. The injection side if slightly swollen and red and little drops of blood came out: all normal for me.
But the Obi didnt turn off. I waited a good 5 minutes and nothing happened. I went to inspect it again at some point and something shifted: then the OBI turned off.

I‘m assuming it’s just the fact, that I pulled it off weird and rhe OBI didnt „notice“ it left my leg or something? And then, when i moved it again, it finished the movement it needed to register that. I‘m unsure and would like to know if I can be assured that everything went well with the injection itself and this is not some weird issue that need tending to? Thank you, in advance, if anyone has had this before.