OPO touch screen issue

Hi

I'm using trying to use the stylus and I get a weird behavior only on OnePlus One phone.

I've activated the "show touches" option in dev settings of OnePlus One, so I see the circle on each touch.
The issue is that the first time the finger touches screen and is moving inside that circle, the circle doesn't move. This makes all drawing apps not register any movement even though the finger is moving. Once the finger goes outside the circle, the circle starts moving and then even very small finger movements are registered by drawing apps.
This doesn't happen on Samsung Galaxy S3 and the drawing happens even inside that little circle from the first time screen is touched. This makes drawing apps very accurate even when writing small letters.

Do you know what might cause this? Is it a hardware or software issue?
I've tried to root OPO, install several mods like CM13, Sultan's mod, SlimSaber or Resurrect mod, didn't solve the issue.

Thank you!

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