Unordered list bullets now showing up

then use a more specific style for the lists in post content:

for instance:
.entry-content ul { list-style-type: disc; margin-left:15px; }

add this to the end of the stylesheet of your theme.

But why would it not be in .post ul?

can’y tell for sure; probably to do with css priorities.

.post ul { } might have a lower priority than .entry-content ul { };
if the bullets were set to ‘none’ in .entry-content ul – then the style with .post ul might not be ‘strong’ enough to overwrite the previous set style.

general, as a last resort, you can ‘force’ a style by adding !important;
example:

.post ul { list-style-type: disc!important; }