The exact meaning is not clear without more context. However, it should read "Bees are loyal only to a point". Only modifies the phrase to a point, not the adjective loyal.
Hi, The idea is this. Consider a situation in which there are reasons and pressures on bees to be disloyal. The bees will initially disregard this pressure. However, as it intensifies there will come a point where the bees will be disloyal. The bees were only loyal up to that point.
eg A woman says to her abusive husband, 'I love you, but only up to a point. After that,