Hi matty_wllson, No dear, it not impossible. It can be happen. You know PR updation is happening every day now-a-days. But in minimum no. And the update is happening in BULK in the interval as you want to say.
It doesn't happen my dear. As we all know that Google PR algorithm update after every three months minimum ans Google has updated its PR on 6 feb last time. Please don't take wrong me.
Yes i just checked your website. It has PR1 and i also checked its whois info. It has been registered on 18 feb of this year.