My Instagram Account Always Looks On and Active No Matter What I Do

I've noticed an unusual issue with my account—it consistently shows as active even when I'm not using it. Despite changing my password, the problem persists. This occurrence isn't constant; it happens sporadically. Strangely, it's specific to this account, and my other account doesn't exhibit the same problem. I'm curious to understand the reason behind this and, more importantly, how to resolve it. Your assistance in addressing this matter would be greatly appreciated.