I have this table in my qweb report, but for some reason, all <th tags are bolded. how can I make them normal, not bold?

and i did try to remove style and class from table

<table style="border-color:grey;" class="table-bordered table-sm o_main_table" name="moves_table">
       <thead>
           <tr>
               <th>No</th>
               <th>Description</th>
               <th class="text-center">Code</th>
               <th class="text-right">Units</th>
               <th class="text-right">Quantity</th>
               <th class="text-right">Package quantity</th>
               <th class="text-right">Net weight (kg)</th>
               <th class="text-right">Weight incl. packaging</th>
               <th class="text-right">Type of package</th>
           </tr>
       </thead>