Hi,
If your plugin is an HikaShop or HikaMarket plugin ; it might not be included in every pages.
Sometimes, if there is no trigger in HikaShop or HikaMarket, the plugins are not loaded for the page generation.
It is really rare but it might be possible.
In that case, you can see to move your plugin in the "system" group ; to be sure that it will be loaded for every pages.
Regards,
Jerome - Obsidev.com
HikaMarket & HikaSerial developer / HikaShop core dev team.
Also helping the HikaShop support team when having some time or couldn't sleep.
By the way, do not send me private message, use the "contact us" form instead.