Invisible wall for object converted from Vice City Stories

Hello,

So i tried to convert and add the White Stallionz bar interior from Vice City stories but there appears to be an invisible wall present and I have no idea how to remove it. If anyone knows how it can be removed or can help me, the .dff .txd and .col can be downloaded from the link below.
https://www.mediafire.com/file/2nyf6810eac4nnl/mainla5514.rar/file
YouTube Video: tNZNIpmM4OM

Thanks in advance