The problem is that the CSS rule pointed out by Chris Laplante is clearly meant to apply only in the expanded view. To fix this problem, it should be changed to read something like this:
.user-show-new .user-header-left .data { /* note the "-left"! */
width: 318px !important;
}
Until this is properly fixed, I've added a patch for this bug to SOUP v1.28; this patch consists simply of the following extra CSS rule:
.user-show-new .user-header.user-header-slim .data {
width: auto !important;
}
(The extra .user-header
in the selector is there just to make this rule more specific than the broken rule quoted by Chris, and therefore able to override it.)