Cal Grant for Summer

On their website it states:

Can I get Cal Grants to pay for summer semester (or quarter) classes?
Yes. If you plan to enroll in summer courses and wish to receive Cal Grant funds, you must notify the California Student Aid Commission or the school you’re attending.

Summer Cal Grant payment amounts are based on the regular academic year grant and may not meet all summer tuition or charges. Summer payments will reduce a student’s total program eligibility for Cal Grant benefits. A student must be enrolled at least half-time to be eligible for summer payment.

Does this mean that if I decide to receive Cal Grant in the summer, I could lose a year off my eligibility? For some reason the California Student Aid Commission won’t load up for me, so I don’t know if it has this information. I’m a CC student so I currently get way less than I normally would. My first year of school plus summer wouldn’t even be close to one year at a 4 year. I don’t see why I would get penalized.