Bhubb - TS has you covered on your immediate situation - you're adding to much chlorine (and in a way that has bad side effects). I'm going to go on a bit of a tangent - feel free to zone out if you'd like.
One item to note with an autocover and using bleach it that you will have to open the pool daily to test, add chemicals, mix and then recover (after at least 30 minutes of mixing - don't want to close up an unmixed pool - bad for cover). This is one (of many) of the reasons why I find our SWG so handy. I test and then adjust the salt cell or pump runtime. No need to open cover. Not that opening the cover each day is such a hassle (quite easy), but the extra cycles on the ropes/pulleys (mine have been a bit finicky) are something I limit if possible. I do open every 4th day or so (during spring/fall when cover is on every day) to air out the pool and use that time to add my acid to lower pH which my SWG causes to rise due to the aeration via the bubbles produced in the process of making chlorine gas. With a pool that large (probably top 5% of all residential pools), a SWG would be an ideal way to chlorinate. You'd ideally want the Pentair IC-60 (60K gallons). We recommend going 2-3x the number of gallons you have for the most cost efficient way to purchase them. The largest Hayward is the T-15 rated for 45K gallons.
Just some food for thought. If you'd like to explore more you can ask further anytime.