When hightlighting text in a PDF the highlight suddenly disappears

I’m working with two windows, where on the left I’m taking notes and on the right I’m reading a PDF. When I try to highlight text in the PDF the highlight disappears almost instantly and I have to try again. The second time the hightlighting is successful and I can copy the text or create a pin.

System: Windows 10, RemNote Desktop 1.4.7