If your style was not made for 3.7 (non-beta) or 3.6.10 and above, then it doesn't have the security tokens in the forms. You will have to go through all the modified templates which have forms in them and make sure the security token is added - click to Edit the template > View History > Compare > see if there is a missing security token, if so, copy/paste it into the template. Do that for every modified template.
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