CSS media query not recognized by Firefox browser

This URL looks fine in Safari and Chrome, but not in Firefox:
http://www.southviewcemetery.com

Specifically, in Firefox there are two logos displaying at full screen size (over 1144px wide), in addition to a few other formatting problems. I have several elements setup with a class "mobileonly" that should not be displaying:

ul#nav1 li.mobileonly{display:none;}
.mobileonly{display:none;}

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HTML:
<div id="mobilespacer" class="mobileonly"><a href="default.asp"><img id="mobilelogo" class="mobileonly" src="img/lg_southview-resp.png" /></a><img id="mobilenav" src="img/gr_mobilenav.jpg" /></div>

<ul id="nav1">
	<li class="mobileonly"><a href="about-us.asp">Home</a></li>
	<li><a href="about-us.asp">About Us</a></li>
	<li><a href="pre-planning.asp">Pre-Planning</a></li>
	<li><a href="burial-arrangements.asp">Burial Arrangements</a></li>
	<li><a href="markers-and-flowers.asp">Markers &amp; Flowers</a></li>
	<li><a href="our-history.asp">Our History</a></li>
</ul>

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I've gone through my code several times, I can't find what is wrong. Would appreciate another set of eyes.

Thank you!
Brad BansnerWeb DeveloperAsked:
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Julian HansenCommented:
Looks identical to me in FF and Chrome.

Are you sure you don't have a caching issue - try a shift refresh - or clear your cache in FF
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Brad BansnerWeb DeveloperAuthor Commented:
I've tried that, repeatedly. Over a period of more than a week. Another user reported the same problem. If its a cache problem, I've never seen one this persistent.
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Julian HansenCommented:
Can you post a screengrab of what you are seeing?
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Brad BansnerWeb DeveloperAuthor Commented:
Yes, here you go.
1.jpg
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Julian HansenCommented:
Here is what I am seeing on FF
ee.jpg
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Brad BansnerWeb DeveloperAuthor Commented:
Yes, that is correct. Odd that I can't get it to look right.
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Brad BansnerWeb DeveloperAuthor Commented:
OK, now I actually went into Firefox, and force-ably cleared the cache ("everything"). Now it works! I work with Firefox all the time on sites where I am constantly adjust the CSS, never had this problem before.
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Julian HansenCommented:
I have a few times - sometimes FF is a bit sticky on the cache refresh.

Glad you got sorted.
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