All In One SEO Pack setting

i just install the wordpress and all in one seo plugin last month , i set the homepage title and description . after google indexed my site with the title and description i put in home page meta tag however , after 1 or 2 month , google just change my description which is from 120 word from my homepage. i check the setting , auto generate description setting is off . Just want to know why this will happen , and how to solve it ? I just want to exact answer how to solve this problem My original meta tag: title: Mahkota Hotel Melaka - Lowest Price Guarantee description: Mahkota Hotel Melaka - the best 4 star hotel in Melaka City Centre. Book Mahkota Hotel Melaka now and enjoy best discount instant confirm online rate. Meta show in google Description: MahkotaHotelMelaka. Mahkota Hotel Melaka is one of the best 4 star hotel in Melaka Raya offering 617 hotel rooms and suits. Positioned on the beachfront ...