[Q] AOSP keyboard on ProBAM KK topic

I have problem with AOSP keyboard on ProBAM KK build 9 ROM by @k2wl
Recently, I flashed this ROM and I realize in under keyboard have a blank space area.
it's annoying for me if i want to type especially pressing the space.
Does anyone has faced this kind of problem?
This is bug on this ROM or just the AOSP keyboard bug?

I hope anyone in this forum can solve this problem..
Thx..

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