Reminder text glitch

Having an interesting situation with some reminder text. I've created a negative ability called "Weak against" that makes creatures with the ability take double damage from certain sources (I'm working on a custom set based on a video game setting I've created). I decided I wanted to do a card that gives hexproof from a quality while also giving weak against a quality, but when I try to put them both on a single line, the reminder text treats the second ability as part of the quality of the first ability.

The specific example is "Equipped creature has hexproof from Fire and weak against Water." (I'm adding some elemental subtypes under the type "Natural," since "Elemental" is already a creature type.) The reminder text comes out as "(This permanent can’t be the target of Fire and weak against Water spells or abilities your opponents control.)" If I reverse the order (weak against Water and hexproof from Fire), it becomes "(It takes double damage from Water and hexproof from Fire sources.)."

Curiously, if I put a period after "Fire" (or "Water" in the second example) it properly treats it as two keywords and the resulting reminder text is "(This permanent can’t be the target of Fire spells or abilities your opponents control. It takes double damage from Water sources.)."

Any idea on how to fix the situation?

(Though, on bigger/rarer cards, I'll be doing without the reminder text altogether, but the aforementioned Equipment will want of both.)