Random Text Entry Bug?

[TheRealNeil]

I have an application with a numeric control on the front panel.

When using the arrow keys to adjust this up, 1 integer at a time, we eventually hit a case where random strings of text get entered in the input box without hitting anything on the keyboard. It'll just start typing something like '99999B8988'.

Are there any known bugs or issues with the usage of numeric fields that could cause this? 

If I remove all functionality from my button (call nothing when button gets pressed) the error does go away. But I'm looking for some clues as to what to look for that could cause such an issue.

[altenbach]

I would think this is due to a programming error, but there is no way to tell from the information given (no VIs attached, not description of the datatype, no description of the display format, no description on where the cursor is when you press the arrow buttons (do you read the keyboard via events or are you using the built-in functionality of the control?), etc.)