That sounds like a web server or caching front-end issue — meaning the Facebook crawler is unable to get a complete version of the webpage (which includes all meta tags). Here what I get after reloading it a few times:
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" "https://www.w3.org/TR/REC-html40/loose.dtd">
<html>
<head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head>
<body>
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<p></p>
</body>
<html><p>1DEe2X&?n~S/'3x Eo>P>4Z?c52BF=? &d]F[O&4UVF)jP
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,2!s5H 7G/bp%N@fU2&cUU)CxW1u[R0!}6T{<hok-></hok-></p></html>
<html><p>q=]C
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@;?iNw3/\}p-VHZ9!v"Z%ZcJr:Bzy#&Q5o5_jS6O0IqBm3KEKm49/?2:\5hY-*5'}~?/|{;/[email protected]w~18~V+z?xE=R枱?vZMQ}~gF%;?}@@Q??'zwG5@?gXc\nW%U3&r<vk></vk></p></html>
<html><p>GA?0RUrra88RM!A$QtZC>&Us
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o{@9N<z></z></p></html>
<html><p>]Tp?tlHRh5:fU#6pN?o?|tB=¨Zb\ Z%ST(~E|:M86tFE(;n4z[V3qz'=Qq4trm:DMlvavaG60.~":?)(r_eAkX=8pOo;Y.q#J(nBj#K$/S20\.D%Dk.%4(Ku?Q
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</html>
If you use any kind of caching front end (service), try disabling / bypassing it for now and see if that helps.
js.