Column thead are offset, need help to fix

Hello,
we love tablepress but we have a problem; since we try to change some style to adapt the colors to our brand colors we can have this problem on the header of the table: the column are off-set.

We take this table for the example :
PC view : https://prnt.sc/OWy2MFMcv_6R
Mobile view : https://prnt.sc/64p7bkIkfqpa

The table in tablepress :
table content : https://prnt.sc/Jl1Z7cAp7wRr
table settings : https://prnt.sc/lc8K_pP3xwfo

We use this stylesheet in “Plugin options” tab : https://prnt.sc/bhGfzBurnyvP

If you want to copy :

.tablepress thead th,
.tablepress tfoot th {
	background-color: #000;
	color: #fff;
	text-align: center;
	border: white solid 1px;
}

.tablepress td,
.tablepress th {
	text-align: center;
	border: black solid 1px;
}

.tablepress-table-description {
	color: #000;
	font-weight: 500;
	margin-bottom: 3px;
}