Wrong currency being shown

Hi!

Since I purchased and installed the woocommerce multi currency plugin, I can say that is not currently working on my website. I have like 6-7 different currency, and at the beginning it seems that it works perfectly, buy sometimes a wrong currency appears. For example:

A visit from Europe should always see EUR €, and sometimes appeears another currency. I have checked everything several times and it seems OK from my understanding. Right now the plugin is disabled but I would like to have it working…

Thanks,

Jorge.