This bug is commonly encountered opening and closing any inventory or chest with the inventory key (default: E). If you press another key too fast, it opens the inventory gui back up as if you had pressed E again. This is easily tested by holding down E when you close your inventory, and then pressing another letter. This bug actually happens with any gui mapped to open and close with a hotkey, such as journeymap.

I personally encounter the bug quite often as I play because I close an inventory with E, and then quickly start trying to walk forward with W and my inventory frequently pops back open if I move too fast.

This is unrelated to the Ticon bug (pack I'm playing doesn't even have ticon installed).

Exact same issue here. Happens on a fresh install of Minecraft 1.7.10 with NotEnoughKeys 1.7.10-3.0.0b45 and Forge 10.13.4.1614-1.7.10.

To reproduce enter the inventory, press and hold the inventory button to exit it, then press another button while still holding the inventory key.

The issue does not occur when you exit the inventory via ESC.

YES, I am having the exact same problem!
as I play on a server, removing this mod is not really possible because it gives mod rejections on login - which is quite annoying as I have spent hours tracking down the mod that causes it.
(I am using ResonantRise 3.3.0.1)