Why doesn't it display the value of the filters?

Question

uCoz

I have filters

<div class="pt-2 f-size-14"><div class="d-flex"><?if($FILTER1_VALUE$='fas fa-award')?><i class="fas fa-award"></i><?endif?> $OTHER1$ $OTHERN$</div></div>
 <div class="pt-2 f-size-14"><div class="d-flex"><?if($FILTER1_VALUE$='fas fa-credit-card')?><i class="fas fa-credit-card"></i><?endif?> $OTHER2$ $OTHERN$</div></div>
 <div class="pt-2 f-size-14"><div class="d-flex"><?if($FILTER1_VALUE$='fas fa-info-circle')?><i class="fas fa-info-circle"></i><?endif?> $OTHER3$ $OTHERN$</div></div>

The bottom line is that if some value is selected in the filter, then an icon from fontawesome is shown. The problem is that if I make a multiple selection when adding material, the icons are not shown at all. If I select only one filter, then it works fine, the icon of the selected filter is shown normally.