Apologies for the late reply. I'd be lying if I said this issue didn't keep me busy all day till today, but I finally managed to solve the issue. I tried a whole variety of solutions, looking at the html, css, deactivating the software, etc. Today, I found what may have been the issue, and probably, as I thought, a rookie mistake.
When linking, I removed the "Same frame (_self)", and once I added it back, it showed and works normally again. Luckily I learned from this experience. Thanks for the support!
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