bet365 odds boost showed max stake £25 then slip capped me at £7.

Saw an odds boost for tonight’s late game, figured I’d throw my usual at it since it advertised the max stake was £25. But as soon as I tapped it into the slip, got blocked at £7 and change. No message, no explanation, just wouldn’t let me raise it above that. Never seen it happen this low before, usually it's at least close to the advertised cap, especially on these promo boosts.

Is this normal for these types of promos or are they shadow-limiting me already? Anyone else get hit with a random max stake much lower than what’s shown?