vBulletin 3.8.4 is at least twelve years old. vBulletin 3 has been End Of Life for three years. If I recall correctly it was built on Transitional HTML 4.0 and CSS2. There have probably been half a dozen or more security updates alone between 3.8.4 and 3.8.11.
Redirects could be an internal problem or an external problem or both.
Updating the JS is likely to break your forums.
Maybe someone who actively runs a vBulletin 3 forum can take a look at your and offer their advice.
Mine would be to use more recent software. You can find used licenses for every version of vBulletin for sale for far less than the cost of a new license.
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