Broken Gameplay

In Minecraft I was creating a stable for my animals then I fell down and I saw that the mule looked frozen. So when I pressed LT it opened the mule's inventory even though I wasn't sneaking. I had to parkour to get out. After that, I continued on the roof. I made a mistake but I couldn't pick up the items, so I went into my inventory. BUT THEN, the mule's inventory blinked in and out. That's when I left the server TOO MANY BUGS. Please fix this if you can. (Sorry, no photographic evidence Also, Please Give me a free cape!)