Post Help required with pen window mode!

When I use apps in pen window mode, I get a weird bug. Refer screen shots.
Doesn't happen with stock pen window apps, just with the ones I added using pen window manager.
I tried this is Xkat and MagazineUX rom. Both have this bug.
Didn't happen to me on 4.3, kitkat is a downgrade when it comes to multi window /pen window support
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My Devices:

Sony Xperia Z1
Galaxy Note 10.1 2014
Xperia SP C5303
White HTC One
Moto Xoom MZ600
Samsung Galaxy S2 GT-I9100
Samsung Galaxy S GT-I9000
HTC Desire
Sony Ericsson Satio
Nokia N96
Nokia 6210 Navigator
Nokia 3110 Classic
Nokia 1100