i had this happen to me as well. but it was more complicated. i would make a portal, go through it, go back through it, and it wouldn't spit me back out of my original portal, and in another world, i made a portal in the over world AND nether (and multiple at that fact) and the all ended up going through the same portal.
I found this out when swimming with my horse that i leaded, and noticed the lead was floating out of my hand. I play bedrock on a Xbox one and i last experienced this in version 1.19.60.