shareit: MYSQL BUG: Duplicate entry on Primary/Unique. If I insert word / word ,word / word

Hi,
I try to INSERT in my database 2 different words with PHP.

word / word <= *is the first*

word /  word <= *is the secound with spaces tabs after slash*

Create Code:

CREATE TABLE `myWords_table` (
    `myWords` VARCHAR(250) NOT NULL,
    PRIMARY KEY (`myWords`)
)
COLLATE='utf8_general_ci'
ENGINE=InnoDB

SQL:

INSERT INTO myWords_table (myWords) VALUES ("word / word"),("word /  word")

Error: Duplicate entry 'word / word' for key 'PRIMARY'

*I also tried Unique Key.
It seems like MYSQL can not handle double Space after /

Can you please help me?*

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