Misaligned border

My table looks like this.
You can see that the border of the first row is not aligned with the border of the rest of the table.
My css code is:

.tablepress thead th,
.tablepress tfoot th {
	background-color: #a4352c;
	color: #fff;
}

.tablepress .odd td {
	background-color: #fff;
}

.tablepress .even td {
	background-color: #f7f7f7;
}

.tablepress .row-hover tr:hover td {
	background-color: #eee;
}

.tablepress tr,
.tablepress tbody td,
.tablepress tfoot th {
	border-style: solid;
	border-width: 1px;
	border-color: #ddd;
}

.tablepress thead th {
	border-style: solid;
	border-width: 1px;
	border-color: #fff;
}

.tablepress tbody td {
	font-family: Arial, Tahoma;
}

What should I change?

https://ww.wp.xz.cn/plugins/tablepress/