Based on the provided screenshot, we noticed that the problematic text box has specific font applied. We tried to reproduce the issue with our examples with no luck. Could you please open new support ticket and provide us with the problematic report? Once we reproduce the issue, we could investigate further why it's caused.
Do you want to have your say when we set our development plans?
Do you want to know when a feature you care about is added or when a bug fixed?
Telerik Feedback Portal
and vote to affect the priority of the items