html - web page scrolls to top when pointer passes over a submit button - but not always -

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i have page on our members' web site (restricted access) has, low down on page, couple of buttons navigate elsewhere. vast majority of people these work few people have reported windows 7 (64 bit) , internet explorer 11 when trying click buttons page scrolls straight top! other combinations of os , browser seem not give behaviour , when used combination had no problems. (makes fault finding difficult!) i've searched internet (google , msn) not found relevant.

i'd grateful ideas on should find solution.

the page written using php no other scripting; style sheet addresses neither forms nor buttons. code 1 of buttons follows, other identical except directs different page. 

       <form id="form1" method="post" enctype="multipart/form-data"  action="http://www.hmrs.org.uk/stewards/stewardslistm.php" target="public">     <input type="hidden" id="member" name="member" value="<?php echo $hmrsno ; ?>">     <input type="submit" id="submit" name="submit" value="list of stewards">     &nbsp;and on stewards&apos;s own pages.    </form>


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