Something adds "=1" to external links

Hi,

I have a link of his kind: https://www.audiosciencereview.com/forum/index.php?threads%2Fparasound-zamp-v-3-amplifier-review.11872

But when I click it, some plugin (may be) adds "=1", making it:

https://www.audiosciencereview.com/forum/index.php?threads%2Fparasound-zamp-v-3-amplifier-review.11872=1

What coud this be?

Try disabling all plugins and then activate one by one..

Did you notice when this started? Did you change something?