Periscope zooming in and out problems

[depthtok33l]

Hello everyone, little problem that has grown to become irritating. For some reason I cannot zoom in or out with both of the periscopes when I'm controlling them (clicked in), I can only zoom in or out if I'm clicked out (cursor is visible in the periscope) if that makes sense.

I've never had this problem before. I didn't play this game for a few months, never touched the game. When I came back on it yesterday I noticed this. Any help would be greatly appreciated.

Additional information

Mod list:

1_TriggerMaru_Overhaul_2-5
1_TMO_25_small_patch
RSRDC_TMO_V502
RSRDC_V5xx_Patch1
1.5_Optical Targeting Correction 031312 for RSRDCv502
1.5_OTC_Realistic Scopes for 16 to 9 RSRDCv502
1.5_OTC_US Radar from Start for RSRDCv502
Improved Stock Environment_v3_TMO&RFB

Hardware changes over the period I didn't play this game:

Changed my main monitor from a 1600 x 900 to a 1920 x 1080 one.
The smaller monitor is made in to a secondary monitor.

Attempt I've done to fix:

Re-installed all mods ~ didn't work