Unexpected character problem in QML

Hello,

There is an unexpected character problem in QML. If I put a text to a ListView delegate if the text includes f and i letters sequentially (for example as in "Configurations" word in the attached files)
then unexpected character is shown in text area.
On the other hand, if I do not bind the width of this delegate to any value, I mean if I give the hard coded number like 386.6 in the 2nd part of the example in 3.png which is the same value with the previously binded object's width value, then this problematic character is gone. Since I must use binded value how can I get rid of this defect?
I could not select the true versions of linux since it is not listed .
OS: Debian GNU/Linux 10 (buster)
Thanks in advance