CalcCheck field not placing correctly.

Using Joomla 1.5.22, Kunena 1.6.2, EasyCalcCheck 1.5.13, localhost install, milkyway template and default Kunena template.

Was using K1.6.1 and EasyCalc check for guest posts and it was working ok. I.e. displaying at the bottom of the post edit page (to the left of the Submit and Cancel buttons).
I upgraded to 1.6.2 and the Calc check started to appear in many places on the form. E.g. It appears randomly between rows: Subject and Topic icon, Boardcode and Message, Message and the Submit / cancel buttons. It would also only appear if I enabled the 'Hidden field' option in EasyCalcCheck. .

This was undesirable behaviour so I downgraded to 1.6.1, then uninstalled and reinstalled EasyCalcCheck. Unfortunately the incorrect behaviour remains.

I don't know whether the issue is an EasyCalcCheck problem or something changed in Kunena 1.6.2 and that persists even after downgrading to 1.6.1. Since I don't have much forum content, I have considered completely uninstalling and reinstalling Kunena but before I do so can you suggest what may have happened / changed or a way to fix it?

Is there any way to force it to appear in the Submit / Cancel section of the form?

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