Price table: empty table cell showing "{{content-7}}"

Hi,
I dont know if this is a bug or if I fucked something up. But my empty table cells in my price table show “{{content-7}}” and “{{content-8}}”.
I have applied some custom css to that table, but its still there when I disable my css codes.

the css I applied: (prijstabel is the css class applied to the table)

.prijstabel>.pricing-table-wrap>.pricing-table>.avia-heading-row>span{
border-left: 0;
border-right: 0;
background-color: #ffffff;
left: 0px;
right: 0px;

}
.prijstabel>.pricing-table-wrap>.pricing-table>.avia-heading-row>div,
.prijstabel>.pricing-table-wrap>.pricing-table>.avia-pricing-row,
.prijstabel>.pricing-table-wrap>.pricing-table>.avia-pricing-row>span {
    color: #eb4f4a;
font-style: italic;
}
.prijstabel>.pricing-table-wrap>.pricing-table>li {
    color: #000000;
font-style: italic;
border-right: 0;
border-left: 0;
}
.prijstabel>.pricing-table-wrap>.pricing-table>li>strong {
    color: #000000;
font-style: italic;
border-right: 0;
border-left: 0;
}
.prijstabel>.pricing-table-wrap>.pricing-table>li:nth-child(1),
.prijstabel>.pricing-table-wrap>.pricing-table>li:nth-child(3),
.prijstabel>.pricing-table-wrap>.pricing-table>li:nth-child(5),
.prijstabel>.pricing-table-wrap>.pricing-table>li:nth-child(7),
.prijstabel>.pricing-table-wrap>.pricing-table>li:nth-child(9),
.prijstabel>.pricing-table-wrap>.pricing-table>li:nth-child(11) {
    background-color: #ffffff !important;
}
.prijstabel>.pricing-table-wrap>.pricing-table>li:nth-child(2),
.prijstabel>.pricing-table-wrap>.pricing-table>li:nth-child(4),
.prijstabel>.pricing-table-wrap>.pricing-table>li:nth-child(6),
.prijstabel>.pricing-table-wrap>.pricing-table>li:nth-child(8),
.prijstabel>.pricing-table-wrap>.pricing-table>li:nth-child(10),
.prijstabel>.pricing-table-wrap>.pricing-table>li:nth-child(12) {
    background-color: #ececec !important;
}

You guys got tips?