Q.growing at allotment
I grow Squashes & pumpkin I have grow them
at the being multi purpose compost and bot
them out being of june.in the allotment
on same site many times Wow am have problems
bot, there is no Sign of any pest or diseases
and or mineral deficiencies. bot pumpkin are
small plants. and the Squashes are more mature
and about to produced fruit do you know whets
happen? sign Mr L moxam

It appears that there is a watering issue. In many cases, not enough water will have this effect. Here is an article that will help: https://www.gardeningknowhow.com/edible/vegetables/pumpkin/pumpkin-growing-tips-for-halloween-pumpkins.htm