Problem with certificate pdf font

I've recently finished Overview of Neo4j 4.x tutorial and I received my certificate pdf, but it's font has a problem, shown in the following picture:

Hello @mreza.azizi74 and welcome to the Neo4j Community!

Unfortunately, your certificates for course completions on our legacy GraphAcademy site (GraphAcademy - Neo4j Graph Data Platform) are currently
broken. We are planning on moving them to the new GraphAcademy site (graphacademy.neo4j.com), but have not yet completed the transition.

Elaine

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