Game zooms to max/min zoom range when simultaneously double pressing and scrolling.

Apologies if this is a client issue but I believe this is a launcher issue as it only started happening when I upgraded from 1.4.3 to 2.1.0, after which I downgraded to 2.0.0(still happened) and then to 1.6.0(stopped happening).
Windows 7 64 bit, java 1.8.0_171

To reproduce, mash double click the middle mouse button and scrolling down simultaneously is the easiest.