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There are too many plants that qualify to accurately answer your question but try goggling for heliopsis. There are many varieties and you may find what you are looking for. There are some varieties that are orange-yellow.

While most Cosmos are annuals, there are perennial varieties. However, unless yours dropped seeds, it is unlikely to return. If it does, you can promptly pull it up and discard it.

Regardless of how you plant them, the right end will come up. Plants naturally have systems in place to ensure even if they are planted upside down, they will grow right side up.

That being said, you should notice that one side of the rootball has more of the finer roots than they other. This is the side that goes down. The plant will come up quicker if planted the right side down, but in the long run, it does not make a difference.

If you like the interesting plumes and seed heads, then I would leaves it as is until spring, at which time you can mow it down and replant. Otherwise, you can perform some fall clean up now.

They have too little light. They need either a brighter window or you need to get a fluorescent bulb and place that a few inches above the seedlings.

While cosmos are generally pretty tough, there are a number of factors that could cause this, such as viral or bacterial disease, bugs such as aphids or thrips, or imbalance in fertilizer, pH, even insecticide chemicals.
This article has general growing information: https://www.gardeningknowhow.com/ornamental/flowers/cosmos/growing-cosmos.htm
If the problem is affecting too many plants, or seems to be worsening, you might want to take samples to the Extension Service, where they can analyze and suggest cures, This article will help you find one: https://www.gardeningknowhow.com/extension-search/