If you use some other contribution that modifies the main page may need to do some changes. For example I use also the column divider add on and have problems because some products had false product id, for example the real product id was 750 and when I clicked the buy now button in main page the product id was 71000.
I manage to overcome that by deleting this 2 lines
$r_params = str_replace("50", "100", $r_params);
$r_params = str_replace("33", "100", $r_params);
in includes/templaters/YOUR TEMPLATE/common/tpl_columnar_display.php
Please check if something similar happens to you with some other add on.
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