Can you send a screenshot of your layers panel..? You shouldn't have any clipping paths if it's just the background colour and the number, is the number outlined as well?
Should be something like this...
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If the bars are a specific width you can use the align tool, specifically the 'Horizontal Distribution Centre'. All you need to do is work out the combined width of your bars, set the two outer bars at either end and then select all and align them.
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What lines do you want to delete?
If it's all the ones outside the main shape you could use your direct selection arrow (white) and click and drag over then and delete. It all depends on how the artwork has been created though, so without having the file to play with is a little hard to be precise.
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Can you provide screenshots of what you are talking about?
What system are you using PC or Mac?
What spec is your machine?
How are you saving the file?
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Sorry it's really difficult to see those screenshots, any chance of a better quality/larger
Have you tried resetting your preferences..?
How to reset Illustrator Preferences - Adobe Support Community - 10602277
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Have you tried clearing your preferences?
How to reset Illustrator Preferences - Adobe Support Community - 10602277
Have you tried uninstalling and reinstalling..?
Uninstall or remove Adobe Creative Cloud apps
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Can you provide us with more details please so we can try and help..?
We need Illustrator version, what system you are working on PC/Mac, what setup you have, does it meet minimun specifications, etc.
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Can you check this thread and see if any of the suggestions here help..?
https://community.adobe.com/t5/illustrator-discussions/illustrator-27-2-chrashing-every-30-min/m-p/13561273
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The edit colors will work on vector artwork and not pixel based artwork, if you want to recolor a photo i would suggest using Photoshop for that and then import into Illustrator.
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If you can open the PDF with Illustrator and you see no issues (not saying you won't) you can select the page elements and create outlines of them and then re-save as a PDF. It would be a case of trial and error and a bit of testing to make sure that this is a viable way of doing what you want.
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Can you give us a bit more information please?
We need to know what system you are using and what your setup is?
What version of Illustrator are you using?
Can you provide any screenshots?
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It sounds like you are outside the shape rather than inside..?
When you hover over the corner widget do you get the bevel icon appearing..
..or do you get the rotaion arrows?
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