Strange performance of one field in a form...

Strange performance of one field in a form...

The application referred to consist several forms and several fields in them.

All forms/ fields are all working normally, except this one - List of Schools (LS)

This LS is linked (look-up) by a List View named "View Updates" with several linked other data source forms.

The LS hold listing of school names, ex:

Yesterday School
Future Academy

When I added data to the View Updates from the LS, it is automatically added with ... dash.. before the school name.

Example:

Yesterday School
.
Other data are not presented like this. Tried to check properties/ definition of the form/ fields, but nothing found...

Any idea?