Strut upper mount Problem ? (picture)

[j-pizzle]

I have my '74 super lowered
empi adj. struts pass the lowest "setting",stock springs and oil filled empi incerts

anyhow I was getting gas and noticed both my struts upper mounts look like this under the hood (notice the gap)...I've No unusual sounds or shaking of any kind at any speed...
What would cause this and what is needed to be done/replaced to fix it.... I'm sure it can't be safe