fundraising plugin on multisite wp with catalog structure WRONG CATALOG for pledge url

My fundraisers page is conigured in plugin settings to”fundraisers”, but because of this site being main of my multisite structure, this link transforms to It shows rather correct (some troubles with styles, but i haven’t looked out for css problems yet). But when I push the “Fund it” button, the browser goes to instead of as set in the settings.

Need to correct some string in plugin code to make this plugin work with WP MU with catalog structure.

Hope for your help!