Blurry text Lumia 640 XL

[veltmanus_wp]

Hello....recently I replaced my Lumia 630 for the Lumia 640 XL. Overall I'm happy with my new phone. However, I noticed that in some apps text can be a bit blurry. It's not the whole text that's blurry, but only some lines. So far I figured out that it only happens in some apps (for example Metromail and also slightly in the app from WindowsCentral). Seems like it does not occur in original Microsoft apps. Can someone relate to this issue?