TOPIC: 'Maximum Length' in custom text field has no effect

I have two custom fields.
The first is a conditional dropdown field that asks a question to which there is one of two answers...Y/N.
The second is a text field that, if the answer is Y in the conditional, then it 'appears'.
I want to be able to limit the number of characters that this field will accept.

I have the 'Maximum Length' field set to 3 (doesn't really matter what number i put here) in the text field which has no effect?! ie I can type 'forever' in the frontend of this box and the text box continues to fill 'ad infinitum'?

Can anyone shed any light?

Joomla -1.5.18
DTREG - 2.6.6

Hello Nathan and DTReg community,
Just thought I'd revisit this issue to see if there are others who may have or are experiencing this.
I had a number of fields setup for my event but had a problem with a custom text field that, no matter how many characters I tried to limit the input to, would have no effect. As a test, I unpublished all but the text field, but on the front end I still can type as many characters as I like in this box? i.e. the maximum characters set appears to have no effect?

Any thoughts or suggestions?

Joomla - 1.5.18
DTReg - 2.6.7
Template used - Joomlashack Inspirion