Those things indicate that the JavaScript was unable to find the markers it needs to modify the postbit. If you turn off the options that require JS (alternate location and removing stuff), they should go away.
I don't know what GARS is but if you're only having trouble with the first post, you might be able to put a conditional in the activity_postbit_epilogue template so it doesn't run for the first post. You might try wrapping the current contents with
Code:
<if condition="$post['postcount']>1">
</if>
though I'm not sure if that will work.