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They may not be getting enough water. Corn has very shallow roots and needs lots of water during its active growth, especially in temps as high as you are experiencing. Typically, the garden needs about an inch or so of water each week. It is a good idea to water deeply (for about 20 min. or so) every other day or two, depending on the weather. Once temps reach 85 F and up, daily watering is often necessary.

The soil could also be lacking nutrients, like nitrogen, which is responsible for growth. A soil test could help determine what, if anything, is lacking or needs to be added.

First off, I'll assume it's Sweet Corn you're talking about.. Field (Dent) corn is left to dry on the stalks and is used to feed animals.. So 1) Watch your Days to Maturity on the package, that's why you "succession plant" so not all ears mature at the same time 2) Your silks (tassels) will have turned brown 3) a finger nail pushed into a kernel will ooze a "milky" stuff... BTW: Have your "water boiling on the stove" i.e. cook it and eat it as soon as possible for the sweetest corn.. I think the sugars start turning into starches after harvest. Did I miss anything? Anyone else want to weigh in? I hope this is helpful. Dave

Here are some articles that will help answer your questions:

https://www.gardeningknowhow.com/edible/vegetables/corn/corn-not-producing-ears.htm

https://www.gardeningknowhow.com/edible/vegetables/corn/early-corn-tasseling.htm

Happy gardening!

Your corn could have been lacking enough nitrogen and water. As a result, it didn't initially produce enough foliage to make good corn. Corn demands more nitrogen and water than most crops. Water stress delays the emergence of the silk more than it delays the tassel. So pollination may be lacking. The pollen may be spent before much silk shows up. Here is more information that may help: http://www.agry.purdue.edu/ext/corn/news/timeless/silks.html
https://www.gardeningknowhow.com/edible/vegetables/corn/corn-not-producing-ears.htm

Different varieties will have different growing patterns.
Often as the corn matures the corn will appear from the top of the husks.
This will not effect the corn at all.

https://www.gardeningknowhow.com/edible/vegetables/corn/how-to-grow-corn.htm

This looks to be a tassel-ear.
The link below explains this event.

https://www.agry.purdue.edu/ext/corn/news/timeless/TasselEars.html